Vodacom service and staff attitude

I've been a Vodacom customer for years now and I've never received any bad service from them until recently when my phone fell down two months back and l took it immediately to the nearest Vodacom shop for repairs.. They repaired it after 3 weeks but was not happy with the way it was and l paid the charged amount of R1500. Within 2days after being repaired it stopped working and l took it back to the same Vodacom shop and they took it back for repairs and they promised to contact me when the phone is ready. They never contacted me back until l went there personally today and l found my phone not well fixed and they told me to leave it they'll take it to the initial person who fixed it..Told them to refund me my money will take it for repairs somewhere else but the technician told me is not possible.. Its been 2 months without my phone which l paid for repairs and it's a contract which I'm still paying monthly. I'm so frustrated and disappointed with the treatment l received from Vodacom l don't know what to do????